DO I NEED EXPONENTIAL'S

[WINDSURF]

HI PILOT'S:
So....i'm fairly new to flying rc ( 2yrs now....yea...and loving it ). I'm currently assembling my newest aircraft ( carden yak 89" ) and will be using the JR x9303 2.4 Ghz transmitter.
Problem is , i don't want to be learning how to dial in exponential's into the transmitter just yet. I would rather just start flying this plane without the exponentials & get used to the quicker thimble response. I'm told exponential's are not needed , if they are not desired . Is this an ok way to go cause i'd like to keep things as simple as possible for now and maybe try exponentials sometime in the future.

Would appreciate some input on this .....thx in advance.

[cliff600]

I don't know what you are flying now, but with the Yak you are building, if you set it up with the throws suggested, it will be very fast. The big surfaces with the latency speed of the 9303 will make it super touchy and on high rates it will be really hard. The Expo does not take away any of your throw, it just gives you some wiggle room around the middle of the stick. I use to fly everything linear, but when I got my 9303 and a big Yak, I had to put in expo. I have gotten use to it now and I like it. I really did not want to start setting up expo in stuff either, but I am glad I did now. You will probably surprise yourself at how much you actually wiggle the sticks wheb you think you are not moving them. I use between 60% and 70% on my Yak

[3ddd]

set up all the throws by the book and wait till later on the expo.be SURE YOU CHECK ALL THE HINGES AS I JUST READ A REPORT OF THE ELEVATOR HINGES COMING OUT ON THE FIRST FLIGHT AND TOTAL LOOSE OF THE AIRCRAFT

[pitviper51]

expo always. makes you look way better then you are.. 60% is goood gives a feel of low rate close to center and hirate if you need it.
mike

[brandonduley]

i usually set in around 30-40% of expo when setting up a new plane, and adjust from there. I have seen people running w/o expo in the 50cc'rs and they are very touchy. if you are not comfortable with putting expo in, then you shouldn't do it, at the end of the day its your plane and you should set it up the way you want to

[Sevans16]

use expo!! Take advantage of the radio you bought. It is like buying a new luxury car and not using a/c or radio cause old car never had that stuff and you don't need that stuff to get from point a to point b.

My last plane only took 15% servo travel on low rates to acheive proper travel and 130% on 3D rates. Just try and control that small of travel with no expo.

If you go against expo. Don't set up 3D rates. Stick with some more old school travel settings. Just remember back in the old days the control surfaces were much smaller and a lot less travel than todays 3D extreme machines such as H9 Carden Yak!

[ericb]

Expo is so easy to setup, I don't know why anybody would not do it. Start at about 30 - 40% and see how it feels. You will fly alot smoother with expo setup.

[rking]

to be able to utilize the throws recommended in the manual of that yak, you'd have to use expo. without it, as stated above, it would be really touchy and sensitive. for low rates, i have about 50-60% of expo added and on high rates about 60-70%.

[Josh Price]

there is two ways to look at it.
1 do you want it to fly as good as it looks on the ground

and
2 do you want it to be as fun to fly as your wallet expects it to.

expo is not a must no but ounce you set it up you will NEVER go back. I put expo in every single thing I fly.

here is a good little test. fly it linear and then go in and put in about 35% expo on ALL the surfaces. no not fly it on high rates because you will over correct yourself if this is your first big bird. just keep it to simple stuff. I promise you this if you try what I said you will add more expo liek the book and people are suggesting and you will never go without ever again. It will make the plane look like it flys 200% better and feel 500% better I promise

[50%plane]

I don't use any expo. I can't stand it. It's all personal opinion.

[mmcconville]

There is no learning curve with Expo. Its a very simple feature and is absolutely necessary. Use 40% (+40% with the JR radio) on low rates on all 3 surfaces, and use 70% on 3D elev rate, 55% on hi aileron and 50% on rudder.

[smokin]

	Quote: Originally Posted by mmcconville
	There is no learning curve with Expo. Its a very simple feature and is absolutely necessary. Use 40% (+40% with the JR radio) on low rates on all 3 surfaces, and use 70% on 3D elev rate, 55% on hi aileron and 50% on rudder.

mike is right! this is very easy to setup and makes flying a new big bird much easier. all the expo does is make a softer, mushier feel to the first portion of the throw of the stick. if you set up the recommended throws and have a linear respone (no expo) it will be VERY fidgety when you just tap the stick. realizing that you'll be nervous upon maiden, your fingers may twitch a bit and the mcconville recommended expo %ages will take away that twitchy response. it really allows you to feel as if there is a more realistic connection between you and the craft.

just input the %ages that showtime suggested and fly, fly, fly!!!!!!

good luck and welcome to the big bird club!!!!!

[mmcconville]

Actually, because servos have rotary output and not linear, the feel of the model with 0 expo in the tx isnt linear, it has negative expo due to the linkage geometry. Meaning it is more sensitive at neutral.

[Tired Old Man]

If you don't yet understand how radio features function, how they work for you, and how to set them up, you're not ready for the Yak. You still need to spend some time with less expensive planes and learn what you and you're equipment is about.

That said and knowing that you're going to do the Yak anyway regardless of your knowledge and ability level or what anyone suggests, without exponential the plane may be far too sensitive for you at low rates, and for certain too much for you to safely handle at high rates. Heed the advice of most of those that have already posted in this thread and use exponential.

From my perspective your low rates would work well for you with a 35% expo on everything except throttle, and a 70% on everything for high rates. As you develop the feel for the plane you can adjust to suit from there.

My .02 anyway.

[Mithrandir]

	Quote: Originally Posted by mmcconville
	Actually, because servos have rotary output and not linear, the feel of the model with 0 expo in the tx isnt linear, it has negative expo due to the linkage geometry. Meaning it is more sensitive at neutral.

Well... yes.. negative expo at the servo... but the opposite, (or positive expo), at the control surface.. so with a nearly 1:1 Servo Arm-to-Control-Horn geometry... one degree at the servo = one degree at the control surface....




I prefer to set up my expo as follows...

Put all the rate switching on one switch... elev, rudder and ails all on, or all off, with one switch... this will reduce pilot load and "Oooops" events.
I also like to set up my Expo so that around center stick, my high rate feels like low rate.
I like my low rate so that I can do snap rolls without getting pitched so deep the plane looses all its speed. Just enuff elevator to do a good spin and just enuff rudder to do a rolling circle and not drop altitude thru KE. Low rate ailerons will give me about a 2 second roll rate.

Much of this is personal prefereance...